[fix] allow the user to overwrite the no_input flag to pip (#5036)

Support `no_input` flag for when you want to e.g. use keyring to authenticate against Google Artifact Registry.

docs/advanced.rst

@@ -107,6 +107,38 @@ Environment variables in the URL part of requirement specifiers can also be expa
 
 Keep in mind that environment variables are expanded in runtime, leaving the entries in ``Pipfile`` or ``Pipfile.lock`` untouched. This is to avoid the accidental leakage of credentials in the source code.
 
+☤ Injecting credentials through keychain support
+------------------------------------------------
+
+Private regirstries on Google Cloud, Azure and AWS support dynamic credentials using
+the keychain implementation. Due to the way the keychain is structured, it might ask
+the user for input. Asking the user for input is disabled. This will disable the keychain
+support completely, unfortunately.
+
+If you want to work with private registries that use the keychain for authentication, you
+can disable the "enforcement of no input".
+
+**Note:** Please be sure that the keychain will really not ask for
+input. Otherwise the process will hang forever!
+
+    [[source]]
+    url = "https://pypi.org/simple"
+    verify_ssl = true
+    name = "pypi"
+
+    [[source]]
+    url = "https://europe-python.pkg.dev/my-project/python/simple"
+    verify_ssl = true
+    name = "private-gcp"
+
+    [packages]
+    flask = "*"
+    private-test-package = {version = "*", index = "private-gcp"}
+
+    [pipenv]
+    disable_pip_input = false
+
+Above example will install ``flask`` and a private package ``private-test-package`` from GCP.
 
 ☤ Specifying Basically Anything
 -------------------------------

news/4706.bugfix.rst

@@ -0,0 +1 @@
+allow the user to disable the ``no_input`` flag, so the use of e.g Google Artifact Registry is possible.

pipenv/utils/resolver.py

@@ -518,7 +518,7 @@ class Resolver:
             pip_options, _ = self.pip_command.parser.parse_args(self.pip_args)
             pip_options.cache_dir = self.project.s.PIPENV_CACHE_DIR
             pip_options.no_python_version_warning = True
-            pip_options.no_input = True
+            pip_options.no_input = self.project.settings.get("disable_pip_input", True)
             pip_options.progress_bar = "off"
             pip_options.ignore_requires_python = True
             pip_options.pre = self.pre or self.project.settings.get(